2 pcd.c (c) 1997-8 Grant R. Guenther <grant@torque.net>
3 Under the terms of the GNU General Public License.
5 This is a high-level driver for parallel port ATAPI CD-ROM
6 drives based on chips supported by the paride module.
8 By default, the driver will autoprobe for a single parallel
9 port ATAPI CD-ROM drive, but if their individual parameters are
10 specified, the driver can handle up to 4 drives.
12 The behaviour of the pcd driver can be altered by setting
13 some parameters from the insmod command line. The following
14 parameters are adjustable:
16 drive0 These four arguments can be arrays of
17 drive1 1-6 integers as follows:
19 drive3 <prt>,<pro>,<uni>,<mod>,<slv>,<dly>
23 <prt> is the base of the parallel port address for
24 the corresponding drive. (required)
26 <pro> is the protocol number for the adapter that
27 supports this drive. These numbers are
28 logged by 'paride' when the protocol modules
29 are initialised. (0 if not given)
31 <uni> for those adapters that support chained
32 devices, this is the unit selector for the
33 chain of devices on the given port. It should
34 be zero for devices that don't support chaining.
37 <mod> this can be -1 to choose the best mode, or one
38 of the mode numbers supported by the adapter.
41 <slv> ATAPI CD-ROMs can be jumpered to master or slave.
42 Set this to 0 to choose the master drive, 1 to
43 choose the slave, -1 (the default) to choose the
46 <dly> some parallel ports require the driver to
47 go more slowly. -1 sets a default value that
48 should work with the chosen protocol. Otherwise,
49 set this to a small integer, the larger it is
50 the slower the port i/o. In some cases, setting
51 this to zero will speed up the device. (default -1)
53 major You may use this parameter to overide the
54 default major number (46) that this driver
55 will use. Be sure to change the device
58 name This parameter is a character string that
59 contains the name the kernel will use for this
60 device (in /proc output, for instance).
63 verbose This parameter controls the amount of logging
64 that the driver will do. Set it to 0 for
65 normal operation, 1 to see autoprobe progress
66 messages, or 2 to see additional debugging
69 nice This parameter controls the driver's use of
70 idle CPU time, at the expense of some speed.
72 If this driver is built into the kernel, you can use kernel
73 the following command line parameters, with the same values
74 as the corresponding module parameters listed above:
82 In addition, you can use the parameter pcd.disable to disable
89 1.01 GRG 1998.01.24 Added test unit ready support
90 1.02 GRG 1998.05.06 Changes to pcd_completion, ready_wait,
91 and loosen interpretation of ATAPI
92 standard for clearing error status.
93 Use spinlocks. Eliminate sti().
94 1.03 GRG 1998.06.16 Eliminated an Ugh
95 1.04 GRG 1998.08.15 Added extra debugging, improvements to
96 pcd_completion, use HZ in loop timing
97 1.05 GRG 1998.08.16 Conformed to "Uniform CD-ROM" standard
98 1.06 GRG 1998.08.19 Added audio ioctl support
99 1.07 GRG 1998.09.24 Increased reset timeout, added jumbo support
103 #define PCD_VERSION "1.07"
105 #define PCD_NAME "pcd"
108 /* Here are things one can override from the insmod command.
109 Most are autoprobed by paride unless set here. Verbose is off
114 static int verbose = 0;
115 static int major = PCD_MAJOR;
116 static char *name = PCD_NAME;
118 static int disable = 0;
120 static int drive0[6] = { 0, 0, 0, -1, -1, -1 };
121 static int drive1[6] = { 0, 0, 0, -1, -1, -1 };
122 static int drive2[6] = { 0, 0, 0, -1, -1, -1 };
123 static int drive3[6] = { 0, 0, 0, -1, -1, -1 };
125 static int (*drives[4])[6] = {&drive0, &drive1, &drive2, &drive3};
126 static int pcd_drive_count;
128 enum {D_PRT, D_PRO, D_UNI, D_MOD, D_SLV, D_DLY};
130 /* end of parameters */
132 #include <linux/module.h>
133 #include <linux/init.h>
134 #include <linux/errno.h>
135 #include <linux/fs.h>
136 #include <linux/kernel.h>
137 #include <linux/delay.h>
138 #include <linux/cdrom.h>
139 #include <linux/spinlock.h>
140 #include <linux/blkdev.h>
141 #include <asm/uaccess.h>
143 static DEFINE_SPINLOCK(pcd_lock);
145 module_param(verbose, bool, 0644);
146 module_param(major, int, 0);
147 module_param(name, charp, 0);
148 module_param(nice, int, 0);
149 module_param_array(drive0, int, NULL, 0);
150 module_param_array(drive1, int, NULL, 0);
151 module_param_array(drive2, int, NULL, 0);
152 module_param_array(drive3, int, NULL, 0);
157 #define PCD_RETRIES 5
158 #define PCD_TMO 800 /* timeout in jiffies */
159 #define PCD_DELAY 50 /* spin delay in uS */
160 #define PCD_READY_TMO 20 /* in seconds */
161 #define PCD_RESET_TMO 100 /* in tenths of a second */
163 #define PCD_SPIN (1000000*PCD_TMO)/(HZ*PCD_DELAY)
167 #define IDE_READY 0x40
168 #define IDE_BUSY 0x80
170 static int pcd_open(struct cdrom_device_info *cdi, int purpose);
171 static void pcd_release(struct cdrom_device_info *cdi);
172 static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr);
173 static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr);
174 static int pcd_tray_move(struct cdrom_device_info *cdi, int position);
175 static int pcd_lock_door(struct cdrom_device_info *cdi, int lock);
176 static int pcd_drive_reset(struct cdrom_device_info *cdi);
177 static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn);
178 static int pcd_audio_ioctl(struct cdrom_device_info *cdi,
179 unsigned int cmd, void *arg);
180 static int pcd_packet(struct cdrom_device_info *cdi,
181 struct packet_command *cgc);
183 static int pcd_detect(void);
184 static void pcd_probe_capabilities(void);
185 static void do_pcd_read_drq(void);
186 static void do_pcd_request(struct request_queue * q);
187 static void do_pcd_read(void);
190 struct pi_adapter pia; /* interface to paride layer */
191 struct pi_adapter *pi;
192 int drive; /* master/slave */
193 int last_sense; /* result of last request sense */
194 int changed; /* media change seen */
195 int present; /* does this unit exist ? */
196 char *name; /* pcd0, pcd1, etc */
197 struct cdrom_device_info info; /* uniform cdrom interface */
198 struct gendisk *disk;
201 static struct pcd_unit pcd[PCD_UNITS];
203 static char pcd_scratch[64];
204 static char pcd_buffer[2048]; /* raw block buffer */
205 static int pcd_bufblk = -1; /* block in buffer, in CD units,
206 -1 for nothing there. See also
210 /* the variables below are used mainly in the I/O request engine, which
211 processes only one request at a time.
214 static struct pcd_unit *pcd_current; /* current request's drive */
215 static struct request *pcd_req;
216 static int pcd_retries; /* retries on current request */
217 static int pcd_busy; /* request being processed ? */
218 static int pcd_sector; /* address of next requested sector */
219 static int pcd_count; /* number of blocks still to do */
220 static char *pcd_buf; /* buffer for request in progress */
222 static int pcd_warned; /* Have we logged a phase warning ? */
224 /* kernel glue structures */
226 static int pcd_block_open(struct block_device *bdev, fmode_t mode)
228 struct pcd_unit *cd = bdev->bd_disk->private_data;
229 return cdrom_open(&cd->info, bdev, mode);
232 static int pcd_block_release(struct gendisk *disk, fmode_t mode)
234 struct pcd_unit *cd = disk->private_data;
235 cdrom_release(&cd->info, mode);
239 static int pcd_block_ioctl(struct block_device *bdev, fmode_t mode,
240 unsigned cmd, unsigned long arg)
242 struct pcd_unit *cd = bdev->bd_disk->private_data;
243 return cdrom_ioctl(&cd->info, bdev, mode, cmd, arg);
246 static int pcd_block_media_changed(struct gendisk *disk)
248 struct pcd_unit *cd = disk->private_data;
249 return cdrom_media_changed(&cd->info);
252 static struct block_device_operations pcd_bdops = {
253 .owner = THIS_MODULE,
254 .open = pcd_block_open,
255 .release = pcd_block_release,
256 .locked_ioctl = pcd_block_ioctl,
257 .media_changed = pcd_block_media_changed,
260 static struct cdrom_device_ops pcd_dops = {
262 .release = pcd_release,
263 .drive_status = pcd_drive_status,
264 .media_changed = pcd_media_changed,
265 .tray_move = pcd_tray_move,
266 .lock_door = pcd_lock_door,
267 .get_mcn = pcd_get_mcn,
268 .reset = pcd_drive_reset,
269 .audio_ioctl = pcd_audio_ioctl,
270 .generic_packet = pcd_packet,
271 .capability = CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK |
272 CDC_MCN | CDC_MEDIA_CHANGED | CDC_RESET |
273 CDC_PLAY_AUDIO | CDC_GENERIC_PACKET | CDC_CD_R |
277 static void pcd_init_units(void)
283 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
284 struct gendisk *disk = alloc_disk(1);
292 cd->drive = (*drives[unit])[D_SLV];
293 if ((*drives[unit])[D_PRT])
296 cd->name = &cd->info.name[0];
297 snprintf(cd->name, sizeof(cd->info.name), "%s%d", name, unit);
298 cd->info.ops = &pcd_dops;
299 cd->info.handle = cd;
301 cd->info.capacity = 1;
304 disk->first_minor = unit;
305 strcpy(disk->disk_name, cd->name); /* umm... */
306 disk->fops = &pcd_bdops;
310 static int pcd_open(struct cdrom_device_info *cdi, int purpose)
312 struct pcd_unit *cd = cdi->handle;
318 static void pcd_release(struct cdrom_device_info *cdi)
322 static inline int status_reg(struct pcd_unit *cd)
324 return pi_read_regr(cd->pi, 1, 6);
327 static inline int read_reg(struct pcd_unit *cd, int reg)
329 return pi_read_regr(cd->pi, 0, reg);
332 static inline void write_reg(struct pcd_unit *cd, int reg, int val)
334 pi_write_regr(cd->pi, 0, reg, val);
337 static int pcd_wait(struct pcd_unit *cd, int go, int stop, char *fun, char *msg)
342 while ((((r = status_reg(cd)) & go) || (stop && (!(r & stop))))
346 if ((r & (IDE_ERR & stop)) || (j >= PCD_SPIN)) {
353 printk("%s: %s %s: alt=0x%x stat=0x%x err=0x%x"
354 " loop=%d phase=%d\n",
355 cd->name, fun, msg, r, s, e, j, p);
361 static int pcd_command(struct pcd_unit *cd, char *cmd, int dlen, char *fun)
365 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
367 if (pcd_wait(cd, IDE_BUSY | IDE_DRQ, 0, fun, "before command")) {
368 pi_disconnect(cd->pi);
372 write_reg(cd, 4, dlen % 256);
373 write_reg(cd, 5, dlen / 256);
374 write_reg(cd, 7, 0xa0); /* ATAPI packet command */
376 if (pcd_wait(cd, IDE_BUSY, IDE_DRQ, fun, "command DRQ")) {
377 pi_disconnect(cd->pi);
381 if (read_reg(cd, 2) != 1) {
382 printk("%s: %s: command phase error\n", cd->name, fun);
383 pi_disconnect(cd->pi);
387 pi_write_block(cd->pi, cmd, 12);
392 static int pcd_completion(struct pcd_unit *cd, char *buf, char *fun)
394 int r, d, p, n, k, j;
400 if (!pcd_wait(cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR,
401 fun, "completion")) {
403 while (read_reg(cd, 7) & IDE_DRQ) {
404 d = read_reg(cd, 4) + 256 * read_reg(cd, 5);
405 n = (d + 3) & 0xfffc;
406 p = read_reg(cd, 2) & 3;
408 if ((p == 2) && (n > 0) && (j == 0)) {
409 pi_read_block(cd->pi, buf, n);
411 printk("%s: %s: Read %d bytes\n",
418 ("%s: %s: Unexpected phase %d, d=%d, k=%d\n",
419 cd->name, fun, p, d, k);
420 if ((verbose < 2) && !pcd_warned) {
423 ("%s: WARNING: ATAPI phase errors\n",
429 printk("%s: Stuck DRQ\n", cd->name);
433 (cd, IDE_BUSY, IDE_DRQ | IDE_READY | IDE_ERR, fun,
441 pi_disconnect(cd->pi);
446 static void pcd_req_sense(struct pcd_unit *cd, char *fun)
448 char rs_cmd[12] = { 0x03, 0, 0, 0, 16, 0, 0, 0, 0, 0, 0, 0 };
452 r = pcd_command(cd, rs_cmd, 16, "Request sense");
455 pcd_completion(cd, buf, "Request sense");
461 printk("%s: %s: Sense key: %x, ASC: %x, ASQ: %x\n",
462 cd->name, fun, buf[2] & 0xf, buf[12], buf[13]);
465 c | ((buf[12] & 0xff) << 8) | ((buf[13] & 0xff) << 16);
467 if ((c == 2) || (c == 6))
471 static int pcd_atapi(struct pcd_unit *cd, char *cmd, int dlen, char *buf, char *fun)
475 r = pcd_command(cd, cmd, dlen, fun);
478 r = pcd_completion(cd, buf, fun);
480 pcd_req_sense(cd, fun);
485 static int pcd_packet(struct cdrom_device_info *cdi, struct packet_command *cgc)
487 return pcd_atapi(cdi->handle, cgc->cmd, cgc->buflen, cgc->buffer,
491 #define DBMSG(msg) ((verbose>1)?(msg):NULL)
493 static int pcd_media_changed(struct cdrom_device_info *cdi, int slot_nr)
495 struct pcd_unit *cd = cdi->handle;
496 int res = cd->changed;
502 static int pcd_lock_door(struct cdrom_device_info *cdi, int lock)
504 char un_cmd[12] = { 0x1e, 0, 0, 0, lock, 0, 0, 0, 0, 0, 0, 0 };
506 return pcd_atapi(cdi->handle, un_cmd, 0, pcd_scratch,
507 lock ? "lock door" : "unlock door");
510 static int pcd_tray_move(struct cdrom_device_info *cdi, int position)
512 char ej_cmd[12] = { 0x1b, 0, 0, 0, 3 - position, 0, 0, 0, 0, 0, 0, 0 };
514 return pcd_atapi(cdi->handle, ej_cmd, 0, pcd_scratch,
515 position ? "eject" : "close tray");
518 static void pcd_sleep(int cs)
520 schedule_timeout_interruptible(cs);
523 static int pcd_reset(struct pcd_unit *cd)
526 int expect[5] = { 1, 1, 1, 0x14, 0xeb };
529 write_reg(cd, 6, 0xa0 + 0x10 * cd->drive);
532 pcd_sleep(20 * HZ / 1000); /* delay a bit */
535 while ((k++ < PCD_RESET_TMO) && (status_reg(cd) & IDE_BUSY))
539 for (i = 0; i < 5; i++)
540 flg &= (read_reg(cd, i + 1) == expect[i]);
543 printk("%s: Reset (%d) signature = ", cd->name, k);
544 for (i = 0; i < 5; i++)
545 printk("%3x", read_reg(cd, i + 1));
547 printk(" (incorrect)");
551 pi_disconnect(cd->pi);
555 static int pcd_drive_reset(struct cdrom_device_info *cdi)
557 return pcd_reset(cdi->handle);
560 static int pcd_ready_wait(struct pcd_unit *cd, int tmo)
562 char tr_cmd[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
568 pcd_atapi(cd, tr_cmd, 0, NULL, DBMSG("test unit ready"));
572 if (!(((p & 0xffff) == 0x0402) || ((p & 0xff) == 6)))
577 return 0x000020; /* timeout */
580 static int pcd_drive_status(struct cdrom_device_info *cdi, int slot_nr)
582 char rc_cmd[12] = { 0x25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
583 struct pcd_unit *cd = cdi->handle;
585 if (pcd_ready_wait(cd, PCD_READY_TMO))
586 return CDS_DRIVE_NOT_READY;
587 if (pcd_atapi(cd, rc_cmd, 8, pcd_scratch, DBMSG("check media")))
592 static int pcd_identify(struct pcd_unit *cd, char *id)
595 char id_cmd[12] = { 0x12, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0 };
599 s = pcd_atapi(cd, id_cmd, 36, pcd_buffer, "identify");
603 if ((pcd_buffer[0] & 0x1f) != 5) {
605 printk("%s: %s is not a CD-ROM\n",
606 cd->name, cd->drive ? "Slave" : "Master");
609 memcpy(id, pcd_buffer + 16, 16);
612 while ((k >= 0) && (id[k] <= 0x20)) {
617 printk("%s: %s: %s\n", cd->name, cd->drive ? "Slave" : "Master", id);
623 * returns 0, with id set if drive is detected
624 * -1, if drive detection failed
626 static int pcd_probe(struct pcd_unit *cd, int ms, char *id)
629 for (cd->drive = 0; cd->drive <= 1; cd->drive++)
630 if (!pcd_reset(cd) && !pcd_identify(cd, id))
634 if (!pcd_reset(cd) && !pcd_identify(cd, id))
640 static void pcd_probe_capabilities(void)
644 char cmd[12] = { 0x5a, 1 << 3, 0x2a, 0, 0, 0, 0, 18, 0, 0, 0, 0 };
647 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
650 r = pcd_atapi(cd, cmd, 18, buffer, "mode sense capabilities");
653 /* we should now have the cap page */
654 if ((buffer[11] & 1) == 0)
655 cd->info.mask |= CDC_CD_R;
656 if ((buffer[11] & 2) == 0)
657 cd->info.mask |= CDC_CD_RW;
658 if ((buffer[12] & 1) == 0)
659 cd->info.mask |= CDC_PLAY_AUDIO;
660 if ((buffer[14] & 1) == 0)
661 cd->info.mask |= CDC_LOCK;
662 if ((buffer[14] & 8) == 0)
663 cd->info.mask |= CDC_OPEN_TRAY;
664 if ((buffer[14] >> 6) == 0)
665 cd->info.mask |= CDC_CLOSE_TRAY;
669 static int pcd_detect(void)
675 printk("%s: %s version %s, major %d, nice %d\n",
676 name, name, PCD_VERSION, major, nice);
679 if (pcd_drive_count == 0) { /* nothing spec'd - so autoprobe for 1 */
681 if (pi_init(cd->pi, 1, -1, -1, -1, -1, -1, pcd_buffer,
682 PI_PCD, verbose, cd->name)) {
683 if (!pcd_probe(cd, -1, id) && cd->disk) {
690 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
691 int *conf = *drives[unit];
694 if (!pi_init(cd->pi, 0, conf[D_PRT], conf[D_MOD],
695 conf[D_UNI], conf[D_PRO], conf[D_DLY],
696 pcd_buffer, PI_PCD, verbose, cd->name))
698 if (!pcd_probe(cd, conf[D_SLV], id) && cd->disk) {
708 printk("%s: No CD-ROM drive found\n", name);
709 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
714 /* I/O request processing */
715 static struct request_queue *pcd_queue;
717 static void do_pcd_request(struct request_queue * q)
722 pcd_req = elv_next_request(q);
726 if (rq_data_dir(pcd_req) == READ) {
727 struct pcd_unit *cd = pcd_req->rq_disk->private_data;
728 if (cd != pcd_current)
731 pcd_sector = pcd_req->sector;
732 pcd_count = pcd_req->current_nr_sectors;
733 pcd_buf = pcd_req->buffer;
735 ps_set_intr(do_pcd_read, NULL, 0, nice);
738 end_request(pcd_req, 0);
742 static inline void next_request(int success)
744 unsigned long saved_flags;
746 spin_lock_irqsave(&pcd_lock, saved_flags);
747 end_request(pcd_req, success);
749 do_pcd_request(pcd_queue);
750 spin_unlock_irqrestore(&pcd_lock, saved_flags);
753 static int pcd_ready(void)
755 return (((status_reg(pcd_current) & (IDE_BUSY | IDE_DRQ)) == IDE_DRQ));
758 static void pcd_transfer(void)
761 while (pcd_count && (pcd_sector / 4 == pcd_bufblk)) {
762 int o = (pcd_sector % 4) * 512;
763 memcpy(pcd_buf, pcd_buffer + o, 512);
770 static void pcd_start(void)
773 char rd_cmd[12] = { 0xa8, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0 };
775 pcd_bufblk = pcd_sector / 4;
777 for (i = 0; i < 4; i++) {
778 rd_cmd[5 - i] = b & 0xff;
782 if (pcd_command(pcd_current, rd_cmd, 2048, "read block")) {
790 ps_set_intr(do_pcd_read_drq, pcd_ready, PCD_TMO, nice);
793 static void do_pcd_read(void)
803 pi_do_claimed(pcd_current->pi, pcd_start);
806 static void do_pcd_read_drq(void)
808 unsigned long saved_flags;
810 if (pcd_completion(pcd_current, pcd_buffer, "read block")) {
811 if (pcd_retries < PCD_RETRIES) {
814 pi_do_claimed(pcd_current->pi, pcd_start);
823 spin_lock_irqsave(&pcd_lock, saved_flags);
824 do_pcd_request(pcd_queue);
825 spin_unlock_irqrestore(&pcd_lock, saved_flags);
828 /* the audio_ioctl stuff is adapted from sr_ioctl.c */
830 static int pcd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd, void *arg)
832 struct pcd_unit *cd = cdi->handle;
836 case CDROMREADTOCHDR:
840 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
842 struct cdrom_tochdr *tochdr =
843 (struct cdrom_tochdr *) arg;
847 r = pcd_atapi(cd, cmd, 12, buffer, "read toc header");
849 tochdr->cdth_trk0 = buffer[2];
850 tochdr->cdth_trk1 = buffer[3];
855 case CDROMREADTOCENTRY:
859 { GPCMD_READ_TOC_PMA_ATIP, 0, 0, 0, 0, 0, 0, 0, 12,
862 struct cdrom_tocentry *tocentry =
863 (struct cdrom_tocentry *) arg;
864 unsigned char buffer[32];
868 (tocentry->cdte_format == CDROM_MSF ? 0x02 : 0);
869 cmd[6] = tocentry->cdte_track;
871 r = pcd_atapi(cd, cmd, 12, buffer, "read toc entry");
873 tocentry->cdte_ctrl = buffer[5] & 0xf;
874 tocentry->cdte_adr = buffer[5] >> 4;
875 tocentry->cdte_datamode =
876 (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
877 if (tocentry->cdte_format == CDROM_MSF) {
878 tocentry->cdte_addr.msf.minute = buffer[9];
879 tocentry->cdte_addr.msf.second = buffer[10];
880 tocentry->cdte_addr.msf.frame = buffer[11];
882 tocentry->cdte_addr.lba =
883 (((((buffer[8] << 8) + buffer[9]) << 8)
884 + buffer[10]) << 8) + buffer[11];
895 static int pcd_get_mcn(struct cdrom_device_info *cdi, struct cdrom_mcn *mcn)
898 { GPCMD_READ_SUBCHANNEL, 0, 0x40, 2, 0, 0, 0, 0, 24, 0, 0, 0 };
901 if (pcd_atapi(cdi->handle, cmd, 24, buffer, "get mcn"))
904 memcpy(mcn->medium_catalog_number, buffer + 9, 13);
905 mcn->medium_catalog_number[13] = 0;
910 static int __init pcd_init(void)
923 /* get the atapi capabilities page */
924 pcd_probe_capabilities();
926 if (register_blkdev(major, name)) {
927 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
932 pcd_queue = blk_init_queue(do_pcd_request, &pcd_lock);
934 unregister_blkdev(major, name);
935 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++)
940 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
942 register_cdrom(&cd->info);
943 cd->disk->private_data = cd;
944 cd->disk->queue = pcd_queue;
952 static void __exit pcd_exit(void)
957 for (unit = 0, cd = pcd; unit < PCD_UNITS; unit++, cd++) {
959 del_gendisk(cd->disk);
961 unregister_cdrom(&cd->info);
965 blk_cleanup_queue(pcd_queue);
966 unregister_blkdev(major, name);
969 MODULE_LICENSE("GPL");
970 module_init(pcd_init)
971 module_exit(pcd_exit)